Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754797AbcDZXYl (ORCPT ); Tue, 26 Apr 2016 19:24:41 -0400 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:40871 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753676AbcDZXYj (ORCPT ); Tue, 26 Apr 2016 19:24:39 -0400 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, "Jiri Olsa" , "Arnaldo Carvalho de Melo" , "Andi Kleen" Date: Wed, 27 Apr 2016 01:02:21 +0200 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) Subject: [PATCH 3.16 035/217] perf tools: Dont stop PMU parsing on alias parse error In-Reply-To: X-SA-Exim-Connect-IP: 2a02:8426:ae4:c500:9cba:69ae:962d:6167 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2004 Lines: 73 3.16.35-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Andi Kleen commit 940db6dcd3f4659303fdf6befe7416adc4d24118 upstream. When an error happens during alias parsing currently the complete parsing of all attributes of the PMU is stopped. This is breaks old perf on a newer kernel that may have not-yet-know alias attributes (such as .scale or .per-pkg). Continue when some attribute is unparseable. This is IMHO a stable candidate and should be backported to older versions to avoid problems with newer kernels. v2: Print warnings when something goes wrong. v3: Change warning to debug output Signed-off-by: Andi Kleen Cc: Jiri Olsa Link: http://lkml.kernel.org/r/1455749095-18358-1-git-send-email-andi@firstfloor.org Signed-off-by: Arnaldo Carvalho de Melo [bwh: Backported to 3.16: adjust context] Signed-off-by: Ben Hutchings --- tools/perf/util/pmu.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) --- a/tools/perf/util/pmu.c +++ b/tools/perf/util/pmu.c @@ -217,13 +217,12 @@ static int pmu_aliases_parse(char *dir, struct dirent *evt_ent; DIR *event_dir; size_t len; - int ret = 0; event_dir = opendir(dir); if (!event_dir) return -EINVAL; - while (!ret && (evt_ent = readdir(event_dir))) { + while ((evt_ent = readdir(event_dir))) { char path[PATH_MAX]; char *name = evt_ent->d_name; FILE *file; @@ -243,17 +242,19 @@ static int pmu_aliases_parse(char *dir, snprintf(path, PATH_MAX, "%s/%s", dir, name); - ret = -EINVAL; file = fopen(path, "r"); - if (!file) - break; + if (!file) { + pr_debug("Cannot open %s\n", path); + continue; + } - ret = perf_pmu__new_alias(head, dir, name, file); + if (perf_pmu__new_alias(head, dir, name, file) < 0) + pr_debug("Cannot set up %s\n", name); fclose(file); } closedir(event_dir); - return ret; + return 0; } /*